A broadband vibration sensor using reflected excessively tilted fiber grating (ExTFG) with clamped beam was proposed. The two ends of reflected ExTFG were fixed, and the fiber grating part was suspended, thus forming a clamped beam structure. The resonance frequency and vibration mode of the proposed sensor were calculated and analyzed by numerical calculation and software simulation. Axial strain, acceleration response and vibration frequency detection experiments were designed and conducted. Experimental results showed that the axial strain sensitivity of TE/TM mode was −2.57 pm/ $\mu \varepsilon $ and −1.6 pm/ $\mu \varepsilon $ , respectively. The first-order resonant frequency of the sensor was 1900Hz with a flat region ranging from 100 Hz to 800 Hz, and the maximum acceleration sensitivity of TE/TM mode in the flat region was 38.79 mV/g and 31.43 mV/g at 800Hz, respectively. In addition, it could detect the vibration frequency range of 100–10000 Hz, and provide a highest signal-to-noise ratios (SNR) of 55.1 dB at 1900 Hz. The proposed sensor possessed a wide response frequency range, and was able to realize dual-parameter detection for acceleration and vibration frequency, which would make its good application prospects in the mechanical vibration detection for large-scale projects.

中文翻译：

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反射式倾斜光纤束夹钳的宽带振动传感器

提出了一种宽带振动传感器，该传感器使用反射过倾斜的光纤光栅（ExTFG）和束流束。反射的ExTFG的两端被固定，并且纤维光栅部分被悬挂，从而形成了夹持光束结构。通过数值计算和软件仿真对所提出的传感器的共振频率和振动模式进行了计算和分析。设计并进行了轴向应变，加速度响应和振动频率检测实验。实验结果表明，TE / TM模式的轴向应变灵敏度为-2.57 pm / $ \ mu \ varepsilon $ 和-1.6 pm / $ \ mu \ varepsilon $ ， 分别。传感器的一阶谐振频率为1900Hz，平坦区域为100 Hz至800 Hz，在800Hz时，平坦区域中TE / TM模式的最大加速度灵敏度为38.79 mV / g和31.43 mV / g，分别。此外，它可以检测100–10000 Hz的振动频率范围，并在1900 Hz时提供55.1 dB的最高信噪比（SNR）。该传感器具有较宽的响应频率范围，能够实现加速度和振动频率的双参数检测，在大型工程机械振动检测中具有良好的应用前景。